404 



BOTANY 



The SPEEMOGOKIA (Fig. 349) are flask-shaped structures, the base of which is 

 covered with the projecting ends of hyphse ; from these are abstricted spermatic. 



each of which has a single nucleus. Morphologically they arc completely < i- 



parahle to the similarly named male sexual organs of some Ascomycetes ; amon^ 

 the Basidiomycetes they persist only in the Uredineae, and even in them are no 



FIG. 348. Puccinia graminis. 1, Transverse section through;^ grass-haulm with group of teleiito- 

 spores ; ?, germinating teleutospore with two basidia ; .-', vegetative. //, fructifying gciminatin;: 

 basidiospore ; tin-' latt'T has formed a secondary spore,, not having been able to infect a lio.-t 

 plant ; ./, a ]KH tion of a group of uredospores () and teleutosporcs (() ; p, the germ-spores : '.'. 

 germinating uredospore. (1, 2, 3, U, after TUI.ASXE ; .'>, 6, after DK BARY ; 1 x 150, 2 x circa 

 230, 3, 4 x 370 5 x 800, 6 x 390, from v. TAVEI., /'//:..) 



longer functional and may be completely wanting. In nutrient solutions the 

 spermatia may put out short germ-tubes but are not capable of infecting the h"st 

 plant. 



The JECIDI\ (Fig. 350) are cup-shaped fructifications, which when young are 

 closed, but later open ; from the ends of the hypha- numerous closely associated 

 chains of spores are abstricted. As a rule the enveloping layer or pcridium of the 



